Timothy Nikkel 21691a950e Bug 1408607. Make all uses of mWillBuildScrollableLayer conditional on painting to the window. r=mstange ...

This mostly restores us to the previous behaviour where we would set mWillBuildScrollableLayer to false for event handling display lists. But it's better because we don't keep flipping its value.

The real reason we want to do this is that it fixes bugs with event handling.

2017-10-16 01:50:35 -05:00

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